Microwave oven



FIG. 1 is a top front and right side perspective view of a microwave oven showing our new design,

FIG. 2 is a left side elevational view thereof,

FIG. 3 is a rear elevational view thereof,

FIG. 4 is a top plan view thereof,

FIG. 5 is a bottom plan view thereof, and

FIG. 6 is a front elevational view thereof with the door opened. 

The ornamental design for a microwave oven, as shown and described. 